4 files changed, 1869 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
new file mode 100644
index 000000000000..66e80c60a68b
--- /dev/null
+++ b/sys/compat/linux/linux_file.c
@@ -0,0 +1,859 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "opt_compat.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/fcntl.h>
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/lock.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/malloc.h>
+#include <sys/dirent.h>
+#include <sys/conf.h>
+#include <sys/tty.h>
+
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#include <compat/linux/linux_util.h>
+
+int
+linux_creat(struct proc *p, struct linux_creat_args *args)
+{
+    struct open_args /* {
+	char *path;
+	int flags;
+	int mode;
+    } */ bsd_open_args;
+    caddr_t sg;
+
+    sg = stackgap_init();
+    CHECKALTCREAT(p, &sg, args->path);
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): creat(%s, %d)\n", 
+	   p->p_pid, args->path, args->mode);
+#endif
+    bsd_open_args.path = args->path;
+    bsd_open_args.mode = args->mode;
+    bsd_open_args.flags = O_WRONLY | O_CREAT | O_TRUNC;
+    return open(p, &bsd_open_args);
+}
+
+int
+linux_open(struct proc *p, struct linux_open_args *args)
+{
+    struct open_args /* {
+	char *path;
+	int flags;
+	int mode;
+    } */ bsd_open_args;
+    int error;
+    caddr_t sg;
+
+    sg = stackgap_init();
+    
+    if (args->flags & LINUX_O_CREAT)
+	CHECKALTCREAT(p, &sg, args->path);
+    else
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): open(%s, 0x%x, 0x%x)\n", 
+	   p->p_pid, args->path, args->flags, args->mode);
+#endif
+    bsd_open_args.flags = 0;
+    if (args->flags & LINUX_O_RDONLY)
+	bsd_open_args.flags |= O_RDONLY;
+    if (args->flags & LINUX_O_WRONLY) 
+	bsd_open_args.flags |= O_WRONLY;
+    if (args->flags & LINUX_O_RDWR)
+	bsd_open_args.flags |= O_RDWR;
+    if (args->flags & LINUX_O_NDELAY)
+	bsd_open_args.flags |= O_NONBLOCK;
+    if (args->flags & LINUX_O_APPEND)
+	bsd_open_args.flags |= O_APPEND;
+    if (args->flags & LINUX_O_SYNC)
+	bsd_open_args.flags |= O_FSYNC;
+    if (args->flags & LINUX_O_NONBLOCK)
+	bsd_open_args.flags |= O_NONBLOCK;
+    if (args->flags & LINUX_FASYNC)
+	bsd_open_args.flags |= O_ASYNC;
+    if (args->flags & LINUX_O_CREAT)
+	bsd_open_args.flags |= O_CREAT;
+    if (args->flags & LINUX_O_TRUNC)
+	bsd_open_args.flags |= O_TRUNC;
+    if (args->flags & LINUX_O_EXCL)
+	bsd_open_args.flags |= O_EXCL;
+    if (args->flags & LINUX_O_NOCTTY)
+	bsd_open_args.flags |= O_NOCTTY;
+    bsd_open_args.path = args->path;
+    bsd_open_args.mode = args->mode;
+
+    error = open(p, &bsd_open_args);
+    if (!error && !(bsd_open_args.flags & O_NOCTTY) && 
+	SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp = fdp->fd_ofiles[p->p_retval[0]];
+
+	if (fp->f_type == DTYPE_VNODE)
+	    fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, p);
+    }
+#ifdef DEBUG
+    printf("Linux-emul(%d): open returns error %d\n", 
+	   p->p_pid, error);
+#endif
+    return error;
+}
+
+struct linux_flock {
+    short l_type;
+    short l_whence;
+    linux_off_t l_start;
+    linux_off_t l_len;
+    linux_pid_t l_pid;
+};
+
+static void
+linux_to_bsd_flock(struct linux_flock *linux_flock, struct flock *bsd_flock)
+{
+    switch (linux_flock->l_type) {
+    case LINUX_F_RDLCK:
+	bsd_flock->l_type = F_RDLCK;
+	break;
+    case LINUX_F_WRLCK:
+	bsd_flock->l_type = F_WRLCK;
+	break;
+    case LINUX_F_UNLCK:
+	bsd_flock->l_type = F_UNLCK;
+	break;
+    default:
+        bsd_flock->l_type = -1;
+        break;
+    }
+    bsd_flock->l_whence = linux_flock->l_whence;
+    bsd_flock->l_start = (off_t)linux_flock->l_start;
+    bsd_flock->l_len = (off_t)linux_flock->l_len;
+    bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
+}
+
+static void
+bsd_to_linux_flock(struct flock *bsd_flock, struct linux_flock *linux_flock)
+{
+    switch (bsd_flock->l_type) {
+    case F_RDLCK:
+	linux_flock->l_type = LINUX_F_RDLCK;
+	break;
+    case F_WRLCK:
+	linux_flock->l_type = LINUX_F_WRLCK;
+	break;
+    case F_UNLCK:
+	linux_flock->l_type = LINUX_F_UNLCK;
+	break;
+    }
+    linux_flock->l_whence = bsd_flock->l_whence;
+    linux_flock->l_start = (linux_off_t)bsd_flock->l_start;
+    linux_flock->l_len = (linux_off_t)bsd_flock->l_len;
+    linux_flock->l_pid = (linux_pid_t)bsd_flock->l_pid;
+}
+
+int
+linux_fcntl(struct proc *p, struct linux_fcntl_args *args)
+{
+    int error, result;
+    struct fcntl_args /* {
+	int fd;
+	int cmd;
+	int arg;
+    } */ fcntl_args; 
+    struct linux_flock linux_flock;
+    struct flock *bsd_flock;
+    caddr_t sg;
+
+    sg = stackgap_init();
+    bsd_flock = (struct flock *)stackgap_alloc(&sg, sizeof(struct flock));
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): fcntl(%d, %08x, *)\n",
+	   p->p_pid, args->fd, args->cmd);
+#endif
+    fcntl_args.fd = args->fd;
+
+    switch (args->cmd) {
+    case LINUX_F_DUPFD:
+	fcntl_args.cmd = F_DUPFD;
+	fcntl_args.arg = args->arg;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_GETFD:
+	fcntl_args.cmd = F_GETFD;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_SETFD:
+	fcntl_args.cmd = F_SETFD;
+	fcntl_args.arg = args->arg;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_GETFL:
+	fcntl_args.cmd = F_GETFL;
+	error = fcntl(p, &fcntl_args);
+	result = p->p_retval[0];
+	p->p_retval[0] = 0;
+	if (result & O_RDONLY) p->p_retval[0] |= LINUX_O_RDONLY;
+	if (result & O_WRONLY) p->p_retval[0] |= LINUX_O_WRONLY;
+	if (result & O_RDWR) p->p_retval[0] |= LINUX_O_RDWR;
+	if (result & O_NDELAY) p->p_retval[0] |= LINUX_O_NONBLOCK;
+	if (result & O_APPEND) p->p_retval[0] |= LINUX_O_APPEND;
+	if (result & O_FSYNC) p->p_retval[0] |= LINUX_O_SYNC;
+	if (result & O_ASYNC) p->p_retval[0] |= LINUX_FASYNC;
+	return error;
+
+    case LINUX_F_SETFL:
+	fcntl_args.arg = 0;
+	if (args->arg & LINUX_O_NDELAY) fcntl_args.arg |= O_NONBLOCK;
+	if (args->arg & LINUX_O_APPEND) fcntl_args.arg |= O_APPEND;
+	if (args->arg & LINUX_O_SYNC) fcntl_args.arg |= O_FSYNC;
+	if (args->arg & LINUX_FASYNC) fcntl_args.arg |= O_ASYNC;
+	fcntl_args.cmd = F_SETFL;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_GETLK:
+	if ((error = copyin((caddr_t)args->arg, (caddr_t)&linux_flock,
+		   	    sizeof(struct linux_flock)))) 
+	    return error;
+	linux_to_bsd_flock(&linux_flock, bsd_flock);
+	fcntl_args.cmd = F_GETLK;
+	fcntl_args.arg = (int)bsd_flock;
+	error = fcntl(p, &fcntl_args);
+	if (error)
+	    return error;
+	bsd_to_linux_flock(bsd_flock, &linux_flock);
+	return copyout((caddr_t)&linux_flock, (caddr_t)args->arg,
+		       sizeof(struct linux_flock));
+
+    case LINUX_F_SETLK:
+	if ((error = copyin((caddr_t)args->arg, (caddr_t)&linux_flock,
+		   	    sizeof(struct linux_flock)))) 
+	    return error;
+	linux_to_bsd_flock(&linux_flock, bsd_flock);
+	fcntl_args.cmd = F_SETLK;
+	fcntl_args.arg = (int)bsd_flock;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_SETLKW:
+	if ((error = copyin((caddr_t)args->arg, (caddr_t)&linux_flock,
+		   	    sizeof(struct linux_flock)))) 
+	    return error;
+	linux_to_bsd_flock(&linux_flock, bsd_flock);
+	fcntl_args.cmd = F_SETLKW;
+	fcntl_args.arg = (int)bsd_flock;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_GETOWN:
+	fcntl_args.cmd = F_GETOWN;
+	return fcntl(p, &fcntl_args);
+
+    case LINUX_F_SETOWN:
+	fcntl_args.cmd = F_SETOWN;
+	fcntl_args.arg = args->arg;
+	return fcntl(p, &fcntl_args);
+    }
+    return EINVAL;
+}
+
+int
+linux_lseek(struct proc *p, struct linux_lseek_args *args)
+{
+
+    struct lseek_args /* {
+	int fd;
+	int pad;
+	off_t offset;
+	int whence;
+    } */ tmp_args;
+    int error;
+
+#ifdef DEBUG
+    printf("Linux-emul(%ld): lseek(%d, %ld, %d)\n",
+	   (long)p->p_pid, args->fdes, args->off, args->whence);
+#endif
+    tmp_args.fd = args->fdes;
+    tmp_args.offset = (off_t)args->off;
+    tmp_args.whence = args->whence;
+    error = lseek(p, &tmp_args);
+    return error;
+}
+
+int
+linux_llseek(struct proc *p, struct linux_llseek_args *args)
+{
+	struct lseek_args bsd_args;
+	int error;
+	off_t off;
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): llseek(%d, %d:%d, %d)\n",
+	   p->p_pid, args->fd, args->ohigh, args->olow, args->whence);
+#endif
+	off = (args->olow) | (((off_t) args->ohigh) << 32);
+
+	bsd_args.fd = args->fd;
+	bsd_args.offset = off;
+	bsd_args.whence = args->whence;
+
+	if ((error = lseek(p, &bsd_args)))
+		return error;
+
+	if ((error = copyout(p->p_retval, (caddr_t)args->res, sizeof (off_t))))
+		return error;
+
+	p->p_retval[0] = 0;
+	return 0;
+}
+
+
+struct linux_dirent {
+    long dino;
+    linux_off_t doff;
+    unsigned short dreclen;
+    char dname[LINUX_NAME_MAX + 1];
+};
+
+#define LINUX_RECLEN(de,namlen) \
+    ALIGN((((char *)&(de)->dname - (char *)de) + (namlen) + 1))
+
+int
+linux_readdir(struct proc *p, struct linux_readdir_args *args)
+{
+	struct linux_getdents_args lda;
+
+	lda.fd = args->fd;
+	lda.dent = args->dent;
+	lda.count = 1;
+	return linux_getdents(p, &lda);
+}
+
+int
+linux_getdents(struct proc *p, struct linux_getdents_args *args)
+{
+    register struct dirent *bdp;
+    struct vnode *vp;
+    caddr_t inp, buf;		/* BSD-format */
+    int len, reclen;		/* BSD-format */
+    caddr_t outp;		/* Linux-format */
+    int resid, linuxreclen=0;	/* Linux-format */
+    struct file *fp;
+    struct uio auio;
+    struct iovec aiov;
+    struct vattr va;
+    off_t off;
+    struct linux_dirent linux_dirent;
+    int buflen, error, eofflag, nbytes, justone;
+    u_long *cookies = NULL, *cookiep;
+    int ncookies;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): getdents(%d, *, %d)\n",
+	   p->p_pid, args->fd, args->count);
+#endif
+    if ((error = getvnode(p->p_fd, args->fd, &fp)) != 0) {
+	return (error);
+    }
+
+    if ((fp->f_flag & FREAD) == 0)
+	return (EBADF);
+
+    vp = (struct vnode *) fp->f_data;
+
+    if (vp->v_type != VDIR)
+	return (EINVAL);
+
+    if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) {
+	return error;
+    }
+
+    nbytes = args->count;
+    if (nbytes == 1) {
+	nbytes = sizeof (struct linux_dirent);
+	justone = 1;
+    }
+    else
+	justone = 0;
+
+    off = fp->f_offset;
+#define	DIRBLKSIZ	512		/* XXX we used to use ufs's DIRBLKSIZ */
+    buflen = max(DIRBLKSIZ, nbytes);
+    buflen = min(buflen, MAXBSIZE);
+    buf = malloc(buflen, M_TEMP, M_WAITOK);
+    vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+again:
+    aiov.iov_base = buf;
+    aiov.iov_len = buflen;
+    auio.uio_iov = &aiov;
+    auio.uio_iovcnt = 1;
+    auio.uio_rw = UIO_READ;
+    auio.uio_segflg = UIO_SYSSPACE;
+    auio.uio_procp = p;
+    auio.uio_resid = buflen;
+    auio.uio_offset = off;
+
+    if (cookies) {
+	free(cookies, M_TEMP);
+	cookies = NULL;
+    }
+
+    error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &ncookies, &cookies);
+    if (error) {
+	goto out;
+    }
+
+    inp = buf;
+    outp = (caddr_t) args->dent;
+    resid = nbytes;
+    if ((len = buflen - auio.uio_resid) <= 0) {
+	goto eof;
+    }
+
+    cookiep = cookies;
+
+    if (cookies) {
+	/*
+	 * When using cookies, the vfs has the option of reading from
+	 * a different offset than that supplied (UFS truncates the
+	 * offset to a block boundary to make sure that it never reads
+	 * partway through a directory entry, even if the directory
+	 * has been compacted).
+	 */
+	while (len > 0 && ncookies > 0 && *cookiep <= off) {
+	    bdp = (struct dirent *) inp;
+	    len -= bdp->d_reclen;
+	    inp += bdp->d_reclen;
+	    cookiep++;
+	    ncookies--;
+	}
+    }
+
+    while (len > 0) {
+	if (cookiep && ncookies == 0)
+	    break;
+	bdp = (struct dirent *) inp;
+	reclen = bdp->d_reclen;
+	if (reclen & 3) {
+	    printf("linux_readdir: reclen=%d\n", reclen);
+	    error = EFAULT;
+	    goto out;
+	}
+  
+	if (bdp->d_fileno == 0) {
+	    inp += reclen;
+	    if (cookiep) {
+		off = *cookiep++;
+		ncookies--;
+	    } else
+		off += reclen;
+	    len -= reclen;
+	    continue;
+	}
+	linuxreclen = LINUX_RECLEN(&linux_dirent, bdp->d_namlen);
+	if (reclen > len || resid < linuxreclen) {
+	    outp++;
+	    break;
+	}
+	linux_dirent.dino = (long) bdp->d_fileno;
+	if (justone) {
+	    /*
+	     * old linux-style readdir usage.
+	     */
+	    linux_dirent.doff = (linux_off_t) linuxreclen;
+	    linux_dirent.dreclen = (u_short) bdp->d_namlen;
+	} else {
+	    linux_dirent.doff = (linux_off_t)(off + reclen);
+	    linux_dirent.dreclen = (u_short) linuxreclen;
+	}
+	strcpy(linux_dirent.dname, bdp->d_name);
+	if ((error = copyout((caddr_t)&linux_dirent, outp, linuxreclen))) {
+	    goto out;
+	}
+	inp += reclen;
+	if (cookiep) {
+	    off = *cookiep++;
+	    ncookies--;
+	} else
+	    off += reclen;
+	outp += linuxreclen;
+	resid -= linuxreclen;
+	len -= reclen;
+	if (justone)
+	    break;
+    }
+
+    if (outp == (caddr_t) args->dent)
+	goto again;
+    fp->f_offset = off;
+
+    if (justone)
+	nbytes = resid + linuxreclen;
+
+eof:
+    p->p_retval[0] = nbytes - resid;
+out:
+    if (cookies)
+	free(cookies, M_TEMP);
+    VOP_UNLOCK(vp, 0, p);
+    free(buf, M_TEMP);
+    return error;
+}
+
+/*
+ * These exist mainly for hooks for doing /compat/linux translation.
+ */
+
+int
+linux_access(struct proc *p, struct linux_access_args *args)
+{
+	struct access_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): access(%s, %d)\n", 
+	    p->p_pid, args->path, args->flags);
+#endif
+	bsd.path = args->path;
+	bsd.flags = args->flags;
+
+	return access(p, &bsd);
+}
+
+int
+linux_unlink(struct proc *p, struct linux_unlink_args *args)
+{
+	struct unlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): unlink(%s)\n", 
+	   p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return unlink(p, &bsd);
+}
+
+int
+linux_chdir(struct proc *p, struct linux_chdir_args *args)
+{
+	struct chdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): chdir(%s)\n", 
+	   p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return chdir(p, &bsd);
+}
+
+int
+linux_chmod(struct proc *p, struct linux_chmod_args *args)
+{
+	struct chmod_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): chmod(%s, %d)\n", 
+	    p->p_pid, args->path, args->mode);
+#endif
+	bsd.path = args->path;
+	bsd.mode = args->mode;
+
+	return chmod(p, &bsd);
+}
+
+int
+linux_chown(struct proc *p, struct linux_chown_args *args)
+{
+	struct chown_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): chown(%s, %d, %d)\n", 
+	    p->p_pid, args->path, args->uid, args->gid);
+#endif
+	bsd.path = args->path;
+	/* XXX size casts here */
+	bsd.uid = args->uid;
+	bsd.gid = args->gid;
+
+	return chown(p, &bsd);
+}
+
+int
+linux_lchown(struct proc *p, struct linux_lchown_args *args)
+{
+	struct lchown_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): lchown(%s, %d, %d)\n", 
+	    p->p_pid, args->path, args->uid, args->gid);
+#endif
+	bsd.path = args->path;
+	/* XXX size casts here */
+	bsd.uid = args->uid;
+	bsd.gid = args->gid;
+
+	return lchown(p, &bsd);
+}
+
+int
+linux_mkdir(struct proc *p, struct linux_mkdir_args *args)
+{
+	struct mkdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTCREAT(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): mkdir(%s, %d)\n", 
+	    p->p_pid, args->path, args->mode);
+#endif
+	bsd.path = args->path;
+	bsd.mode = args->mode;
+
+	return mkdir(p, &bsd);
+}
+
+int
+linux_rmdir(struct proc *p, struct linux_rmdir_args *args)
+{
+	struct rmdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): rmdir(%s)\n", 
+	    p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return rmdir(p, &bsd);
+}
+
+int
+linux_rename(struct proc *p, struct linux_rename_args *args)
+{
+	struct rename_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->from);
+	CHECKALTCREAT(p, &sg, args->to);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): rename(%s, %s)\n", 
+	    p->p_pid, args->from, args->to);
+#endif
+	bsd.from = args->from;
+	bsd.to = args->to;
+
+	return rename(p, &bsd);
+}
+
+int
+linux_symlink(struct proc *p, struct linux_symlink_args *args)
+{
+	struct symlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+	CHECKALTCREAT(p, &sg, args->to);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): symlink(%s, %s)\n", 
+	    p->p_pid, args->path, args->to);
+#endif
+	bsd.path = args->path;
+	bsd.link = args->to;
+
+	return symlink(p, &bsd);
+}
+
+int
+linux_readlink(struct proc *p, struct linux_readlink_args *args)
+{
+	struct readlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->name);
+
+#ifdef DEBUG
+        printf("Linux-emul(%ld): readlink(%s, %p, %d)\n", 
+	    (long)p->p_pid, args->name, (void *)args->buf, args->count);
+#endif
+	bsd.path = args->name;
+	bsd.buf = args->buf;
+	bsd.count = args->count;
+
+	return readlink(p, &bsd);
+}
+
+int
+linux_truncate(struct proc *p, struct linux_truncate_args *args)
+{
+	struct truncate_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): truncate(%s, %ld)\n", 
+	    p->p_pid, args->path, args->length);
+#endif
+	bsd.path = args->path;
+	bsd.length = args->length;
+
+	return truncate(p, &bsd);
+}
+
+int
+linux_link(struct proc *p, struct linux_link_args *args)
+{
+    struct link_args bsd;
+    caddr_t sg;
+
+    sg = stackgap_init();
+    CHECKALTEXIST(p, &sg, args->path);
+    CHECKALTCREAT(p, &sg, args->to);
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): link(%s, %s)\n", p->p_pid, args->path, args->to);
+#endif
+
+    bsd.path = args->path;
+    bsd.link = args->to;
+
+    return link(p, &bsd);
+}
+
+int
+linux_getcwd(struct proc *p, struct linux_getcwd_args *args)
+{
+	struct __getcwd_args bsd;
+	caddr_t sg;
+	int error, len;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): getcwd(%p, %ld)\n", (long)p->p_pid,
+	       args->buf, args->bufsize);
+#endif
+
+	sg = stackgap_init();
+	bsd.buf = stackgap_alloc(&sg, SPARE_USRSPACE);
+	bsd.buflen = SPARE_USRSPACE;
+	error = __getcwd(p, &bsd);
+	if (!error) {
+		len = strlen(bsd.buf) + 1;
+		if (len <= args->bufsize) {
+			p->p_retval[0] = len;
+			error = copyout(bsd.buf, args->buf, len);
+		}
+		else
+			error = ERANGE;
+	}
+	return (error);
+}
+
+int
+linux_fdatasync(p, uap)
+	struct proc *p;
+	struct linux_fdatasync_args *uap;
+{
+	struct fsync_args bsd;
+
+	bsd.fd = uap->fd;
+	return fsync(p, &bsd);
+}
+
+int
+linux_pread(p, uap)
+	struct proc *p;
+	struct linux_pread_args *uap;
+{
+	struct pread_args bsd;
+
+	bsd.fd = uap->fd;
+	bsd.buf = uap->buf;
+	bsd.nbyte = uap->nbyte;
+	bsd.offset = uap->offset;
+	return pread(p, &bsd);
+}
+
+int
+linux_pwrite(p, uap)
+	struct proc *p;
+	struct linux_pwrite_args *uap;
+{
+	struct pwrite_args bsd;
+
+	bsd.fd = uap->fd;
+	bsd.buf = uap->buf;
+	bsd.nbyte = uap->nbyte;
+	bsd.offset = uap->offset;
+	return pwrite(p, &bsd);
+}
diff --git a/sys/compat/linux/linux_ipc.c b/sys/compat/linux/linux_ipc.c
new file mode 100644
index 000000000000..48e13d578277
--- /dev/null
+++ b/sys/compat/linux/linux_ipc.c
@@ -0,0 +1,447 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/proc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#include <compat/linux/linux_ipc.h>
+#include <compat/linux/linux_util.h>
+
+struct linux_ipc_perm {
+    linux_key_t key;
+    unsigned short uid;
+    unsigned short gid;
+    unsigned short cuid;
+    unsigned short cgid;
+    unsigned short mode;
+    unsigned short seq;
+};
+
+static void
+linux_to_bsd_ipc_perm(struct linux_ipc_perm *lpp, struct ipc_perm *bpp)
+{
+    bpp->key = lpp->key;
+    bpp->uid = lpp->uid;
+    bpp->gid = lpp->gid;
+    bpp->cuid = lpp->cuid;
+    bpp->cgid = lpp->cgid;
+    bpp->mode = lpp->mode;
+    bpp->seq = lpp->seq;
+}
+
+
+static void
+bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct linux_ipc_perm *lpp)
+{
+    lpp->key = bpp->key;
+    lpp->uid = bpp->uid;
+    lpp->gid = bpp->gid;
+    lpp->cuid = bpp->cuid;
+    lpp->cgid = bpp->cgid;
+    lpp->mode = bpp->mode;
+    lpp->seq = bpp->seq;
+}
+
+struct linux_semid_ds {
+	struct linux_ipc_perm	sem_perm;
+	linux_time_t		sem_otime;
+	linux_time_t		sem_ctime;
+	void			*sem_base;
+	void			*sem_pending;
+	void			*sem_pending_last;
+	void			*undo;
+	ushort			sem_nsems;
+};
+
+struct linux_shmid_ds {
+    struct linux_ipc_perm shm_perm;
+    int shm_segsz;
+    linux_time_t shm_atime;
+    linux_time_t shm_dtime;
+    linux_time_t shm_ctime;
+    ushort shm_cpid;
+    ushort shm_lpid;
+    short shm_nattch;
+    ushort private1;
+    void *private2;
+    void *private3;
+};
+
+static void
+linux_to_bsd_semid_ds(struct linux_semid_ds *lsp, struct semid_ds *bsp)
+{
+    linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
+    bsp->sem_otime = lsp->sem_otime;
+    bsp->sem_ctime = lsp->sem_ctime;
+    bsp->sem_nsems = lsp->sem_nsems;
+    bsp->sem_base = lsp->sem_base;
+}
+
+static void
+bsd_to_linux_semid_ds(struct semid_ds *bsp, struct linux_semid_ds *lsp)
+{
+	bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
+	lsp->sem_otime = bsp->sem_otime;
+	lsp->sem_ctime = bsp->sem_ctime;
+	lsp->sem_nsems = bsp->sem_nsems;
+	lsp->sem_base = bsp->sem_base;
+}
+
+static void
+linux_to_bsd_shmid_ds(struct linux_shmid_ds *lsp, struct shmid_ds *bsp)
+{
+    linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
+    bsp->shm_segsz = lsp->shm_segsz;
+    bsp->shm_lpid = lsp->shm_lpid;
+    bsp->shm_cpid = lsp->shm_cpid;
+    bsp->shm_nattch = lsp->shm_nattch;
+    bsp->shm_atime = lsp->shm_atime;
+    bsp->shm_dtime = lsp->shm_dtime;
+    bsp->shm_ctime = lsp->shm_ctime;
+    bsp->shm_internal = lsp->private3;	/* this goes (yet) SOS */
+}
+
+static void
+bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct linux_shmid_ds *lsp)
+{
+    bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
+    lsp->shm_segsz = bsp->shm_segsz;
+    lsp->shm_lpid = bsp->shm_lpid;
+    lsp->shm_cpid = bsp->shm_cpid;
+    lsp->shm_nattch = bsp->shm_nattch;
+    lsp->shm_atime = bsp->shm_atime;
+    lsp->shm_dtime = bsp->shm_dtime;
+    lsp->shm_ctime = bsp->shm_ctime;
+    lsp->private3 = bsp->shm_internal;	/* this goes (yet) SOS */
+}
+
+int
+linux_semop(struct proc *p, struct linux_ipc_args *args)
+{
+	struct semop_args /* {
+	int	semid;
+	struct	sembuf *sops;
+	int		nsops;
+	} */ bsd_args;
+
+	bsd_args.semid = args->arg1;
+	bsd_args.sops = (struct sembuf *)args->ptr;
+	bsd_args.nsops = args->arg2;
+	return semop(p, &bsd_args);
+}
+
+int
+linux_semget(struct proc *p, struct linux_ipc_args *args)
+{
+	struct semget_args /* {
+	key_t	key;
+	int		nsems;
+	int		semflg;
+	} */ bsd_args;
+
+	bsd_args.key = args->arg1;
+	bsd_args.nsems = args->arg2;
+	bsd_args.semflg = args->arg3;
+	return semget(p, &bsd_args);
+}
+
+int
+linux_semctl(struct proc *p, struct linux_ipc_args *args)
+{
+	struct linux_semid_ds	linux_semid;
+	struct semid_ds	bsd_semid;
+	struct __semctl_args /* {
+	int		semid;
+	int		semnum;
+	int		cmd;
+	union	semun *arg;
+	} */ bsd_args;
+	int	error;
+	caddr_t sg, unptr, dsp, ldsp;
+
+	sg = stackgap_init();
+	bsd_args.semid = args->arg1;
+	bsd_args.semnum = args->arg2;
+	bsd_args.cmd = args->arg3;
+	bsd_args.arg = (union semun *)args->ptr;
+
+	switch (args->arg3) {
+	case LINUX_IPC_RMID:
+		bsd_args.cmd = IPC_RMID;
+		break;
+	case LINUX_GETNCNT:
+		bsd_args.cmd = GETNCNT;
+		break;
+	case LINUX_GETPID:
+		bsd_args.cmd = GETPID;
+		break;
+	case LINUX_GETVAL:
+		bsd_args.cmd = GETVAL;
+		break;
+	case LINUX_GETZCNT:
+		bsd_args.cmd = GETZCNT;
+		break;
+	case LINUX_SETVAL:
+		bsd_args.cmd = SETVAL;
+		break;
+	case LINUX_IPC_SET:
+		bsd_args.cmd = IPC_SET;
+		error = copyin(args->ptr, &ldsp, sizeof(ldsp));
+		if (error)
+			return error;
+		error = copyin(ldsp, (caddr_t)&linux_semid, sizeof(linux_semid));
+		if (error)
+			return error;
+		linux_to_bsd_semid_ds(&linux_semid, &bsd_semid);
+		unptr = stackgap_alloc(&sg, sizeof(union semun));
+		dsp = stackgap_alloc(&sg, sizeof(struct semid_ds));
+		error = copyout((caddr_t)&bsd_semid, dsp, sizeof(bsd_semid));
+		if (error)
+			return error;
+		error = copyout((caddr_t)&dsp, unptr, sizeof(dsp));
+		if (error)
+			return error;
+		bsd_args.arg = (union semun *)unptr;
+		return __semctl(p, &bsd_args);
+	case LINUX_IPC_STAT:
+		bsd_args.cmd = IPC_STAT;
+		unptr = stackgap_alloc(&sg, sizeof(union semun *));
+		dsp = stackgap_alloc(&sg, sizeof(struct semid_ds));
+		error = copyout((caddr_t)&dsp, unptr, sizeof(dsp));
+		if (error)
+			return error;
+		bsd_args.arg = (union semun *)unptr;
+		error = __semctl(p, &bsd_args);
+		if (error)
+			return error;
+		error = copyin(dsp, (caddr_t)&bsd_semid, sizeof(bsd_semid));
+		if (error)
+			return error;
+		bsd_to_linux_semid_ds(&bsd_semid, &linux_semid);
+		error = copyin(args->ptr, &ldsp, sizeof(ldsp));
+		if (error)
+			return error;
+		return copyout((caddr_t)&linux_semid, ldsp, sizeof(linux_semid));
+	case LINUX_GETALL:
+		/* FALLTHROUGH */
+	case LINUX_SETALL:
+		/* FALLTHROUGH */
+	default:
+		uprintf("LINUX: 'ipc' typ=%d not implemented\n", args->what);
+		return EINVAL;
+	}
+	return __semctl(p, &bsd_args);
+}
+
+int
+linux_msgsnd(struct proc *p, struct linux_ipc_args *args)
+{
+    struct msgsnd_args /* {
+	int     msqid;   
+	void    *msgp;   
+	size_t  msgsz;   
+	int     msgflg; 
+    } */ bsd_args;
+
+    bsd_args.msqid = args->arg1;
+    bsd_args.msgp = args->ptr;
+    bsd_args.msgsz = args->arg2;
+    bsd_args.msgflg = args->arg3;
+    return msgsnd(p, &bsd_args);
+}
+
+int
+linux_msgrcv(struct proc *p, struct linux_ipc_args *args)
+{
+    struct msgrcv_args /* {     
+        int 	msqid;   
+	void	*msgp;   
+	size_t	msgsz;   
+	long	msgtyp; 
+	int	msgflg; 
+    } */ bsd_args; 
+
+    bsd_args.msqid = args->arg1;
+    bsd_args.msgp = args->ptr;
+    bsd_args.msgsz = args->arg2;
+    bsd_args.msgtyp = 0;
+    bsd_args.msgflg = args->arg3;
+    return msgrcv(p, &bsd_args);
+}
+
+int
+linux_msgget(struct proc *p, struct linux_ipc_args *args)
+{
+    struct msgget_args /* {
+	key_t	key;
+        int 	msgflg;
+    } */ bsd_args;
+
+    bsd_args.key = args->arg1;
+    bsd_args.msgflg = args->arg2;
+    return msgget(p, &bsd_args);
+}
+
+int
+linux_msgctl(struct proc *p, struct linux_ipc_args *args)
+{
+    struct msgctl_args /* {
+	int     msqid; 
+	int     cmd;
+	struct	msqid_ds *buf;
+    } */ bsd_args;
+    int error;
+
+    bsd_args.msqid = args->arg1;
+    bsd_args.cmd = args->arg2;
+    bsd_args.buf = (struct msqid_ds *)args->ptr;
+    error = msgctl(p, &bsd_args);
+    return ((args->arg2 == LINUX_IPC_RMID && error == EINVAL) ? 0 : error);
+}
+
+int
+linux_shmat(struct proc *p, struct linux_ipc_args *args)
+{
+    struct shmat_args /* {
+	int shmid;
+	void *shmaddr;
+	int shmflg;
+    } */ bsd_args;
+    int error;
+
+    bsd_args.shmid = args->arg1;
+    bsd_args.shmaddr = args->ptr;
+    bsd_args.shmflg = args->arg2;
+    if ((error = shmat(p, &bsd_args)))
+	return error;
+    if ((error = copyout(p->p_retval, (caddr_t)args->arg3, sizeof(int))))
+	return error;
+    p->p_retval[0] = 0;
+    return 0;
+}
+
+int
+linux_shmdt(struct proc *p, struct linux_ipc_args *args)
+{
+    struct shmdt_args /* {
+	void *shmaddr;
+    } */ bsd_args;
+
+    bsd_args.shmaddr = args->ptr;
+    return shmdt(p, &bsd_args);
+}
+
+int
+linux_shmget(struct proc *p, struct linux_ipc_args *args)
+{
+    struct shmget_args /* {
+	key_t key;
+	int size;
+	int shmflg;
+    } */ bsd_args;
+
+    bsd_args.key = args->arg1;
+    bsd_args.size = args->arg2;
+    bsd_args.shmflg = args->arg3;
+    return shmget(p, &bsd_args);
+}
+
+int
+linux_shmctl(struct proc *p, struct linux_ipc_args *args)
+{
+    struct shmid_ds bsd_shmid;
+    struct linux_shmid_ds linux_shmid;
+    struct shmctl_args /* {
+	int shmid;
+	int cmd;
+	struct shmid_ds *buf;
+    } */ bsd_args;
+    int error;
+    caddr_t sg = stackgap_init();
+
+    switch (args->arg2) {
+    case LINUX_IPC_STAT:
+	bsd_args.shmid = args->arg1;
+	bsd_args.cmd = IPC_STAT;
+	bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
+	if ((error = shmctl(p, &bsd_args)))
+	    return error;
+	if ((error = copyin((caddr_t)bsd_args.buf, (caddr_t)&bsd_shmid,
+		    	    sizeof(struct shmid_ds))))
+	    return error;
+	bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
+	return copyout((caddr_t)&linux_shmid, args->ptr, sizeof(linux_shmid));
+
+    case LINUX_IPC_SET:
+	if ((error = copyin(args->ptr, (caddr_t)&linux_shmid,
+		    	    sizeof(linux_shmid))))
+	    return error;
+	linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
+	bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
+	if ((error = copyout((caddr_t)&bsd_shmid, (caddr_t)bsd_args.buf,
+		     	     sizeof(struct shmid_ds))))
+	    return error;
+	bsd_args.shmid = args->arg1;
+	bsd_args.cmd = IPC_SET;
+	return shmctl(p, &bsd_args);
+
+    case LINUX_IPC_RMID:
+	bsd_args.shmid = args->arg1;
+	bsd_args.cmd = IPC_RMID;
+	if (NULL == args->ptr)
+	    bsd_args.buf = NULL;
+	else {
+	    if ((error = copyin(args->ptr, (caddr_t)&linux_shmid, 
+		    		sizeof(linux_shmid))))
+		return error;
+	    linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
+	    bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
+	    if ((error = copyout((caddr_t)&bsd_shmid, (caddr_t)bsd_args.buf,
+		     		 sizeof(struct shmid_ds))))
+		return error;
+	}
+	return shmctl(p, &bsd_args);
+
+    case LINUX_IPC_INFO:
+    case LINUX_SHM_STAT:
+    case LINUX_SHM_INFO:
+    case LINUX_SHM_LOCK:
+    case LINUX_SHM_UNLOCK:
+    default:
+	uprintf("LINUX: 'ipc' typ=%d not implemented\n", args->what);
+	return EINVAL;
+    }
+}
diff --git a/sys/compat/linux/linux_stats.c b/sys/compat/linux/linux_stats.c
new file mode 100644
index 000000000000..573cd74d251d
--- /dev/null
+++ b/sys/compat/linux/linux_stats.c
@@ -0,0 +1,377 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/dirent.h>
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/vnode.h>
+
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#include <compat/linux/linux_util.h>
+
+struct linux_newstat {
+	u_short	stat_dev;
+	u_short	__pad1;
+	u_long	stat_ino;
+	u_short	stat_mode;
+	u_short	stat_nlink;
+	u_short	stat_uid;
+	u_short	stat_gid;
+	u_short	stat_rdev;
+	u_short	__pad2;
+	u_long	stat_size;
+	u_long	stat_blksize;
+	u_long	stat_blocks;
+	u_long	stat_atime;
+	u_long	__unused1;
+	u_long	stat_mtime;
+	u_long	__unused2;
+	u_long	stat_ctime;
+	u_long	__unused3;
+	u_long	__unused4;
+	u_long	__unused5;
+};
+
+struct linux_ustat 
+{
+	int	f_tfree;
+	u_long	f_tinode;
+	char	f_fname[6];
+	char	f_fpack[6];
+};
+
+static int
+newstat_copyout(struct stat *buf, void *ubuf)
+{
+	struct linux_newstat tbuf;
+
+	tbuf.stat_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
+	tbuf.stat_ino = buf->st_ino;
+	tbuf.stat_mode = buf->st_mode;
+	tbuf.stat_nlink = buf->st_nlink;
+	tbuf.stat_uid = buf->st_uid;
+	tbuf.stat_gid = buf->st_gid;
+	tbuf.stat_rdev = buf->st_rdev;
+	tbuf.stat_size = buf->st_size;
+	tbuf.stat_atime = buf->st_atime;
+	tbuf.stat_mtime = buf->st_mtime;
+	tbuf.stat_ctime = buf->st_ctime;
+	tbuf.stat_blksize = buf->st_blksize;
+	tbuf.stat_blocks = buf->st_blocks;
+
+	return (copyout(&tbuf, ubuf, sizeof(tbuf)));
+}
+
+int
+linux_newstat(struct proc *p, struct linux_newstat_args *args)
+{
+	struct stat buf;
+	struct nameidata nd;
+	int error;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): newstat(%s, *)\n", (long)p->p_pid,
+	       args->path);
+#endif
+
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
+	       args->path, p);
+	error = namei(&nd);
+	if (error)
+		return (error);
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+
+	error = vn_stat(nd.ni_vp, &buf, p);
+	vput(nd.ni_vp);
+	if (error)
+		return (error);
+
+	return (newstat_copyout(&buf, args->buf));
+}
+
+/*
+ * Get file status; this version does not follow links.
+ */
+int
+linux_newlstat(p, uap)
+	struct proc *p;
+	struct linux_newlstat_args *uap;
+{
+	int error;
+	struct vnode *vp;
+	struct stat sb;
+	struct nameidata nd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, uap->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): newlstat(%s, *)\n", (long)p->p_pid,
+	       uap->path);
+#endif
+
+	NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
+	       uap->path, p);
+	error = namei(&nd);
+	if (error)
+		return (error);
+	NDFREE(&nd, NDF_ONLY_PNBUF); 
+
+	vp = nd.ni_vp;
+	error = vn_stat(vp, &sb, p);
+	vput(vp);
+	if (error)
+		return (error);
+
+	return (newstat_copyout(&sb, uap->buf));
+}
+
+int
+linux_newfstat(struct proc *p, struct linux_newfstat_args *args)
+{
+	struct filedesc *fdp;
+	struct file *fp;
+	struct stat buf;
+	int error;
+
+	fdp = p->p_fd;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): newfstat(%d, *)\n", (long)p->p_pid, args->fd);
+#endif
+
+	if ((unsigned)args->fd >= fdp->fd_nfiles ||
+	    (fp = fdp->fd_ofiles[args->fd]) == NULL)
+		return (EBADF);
+
+	error = fo_stat(fp, &buf, p);
+	if (!error)
+		error = newstat_copyout(&buf, args->buf);
+
+	return (error);
+}
+
+struct linux_statfs_buf {
+	long ftype;
+	long fbsize;
+	long fblocks;
+	long fbfree;
+	long fbavail;
+	long ffiles;
+	long fffree;
+	linux_fsid_t ffsid;
+	long fnamelen;
+	long fspare[6];
+};
+
+#ifndef VT_NWFS
+#define	VT_NWFS	VT_TFS	/* XXX - bug compatibility with sys/nwfs/nwfs_node.h */
+#endif
+
+#define	LINUX_CODA_SUPER_MAGIC	0x73757245L
+#define	LINUX_EXT2_SUPER_MAGIC	0xEF53L
+#define	LINUX_HPFS_SUPER_MAGIC	0xf995e849L
+#define	LINUX_ISOFS_SUPER_MAGIC	0x9660L
+#define	LINUX_MSDOS_SUPER_MAGIC	0x4d44L
+#define	LINUX_NCP_SUPER_MAGIC	0x564cL
+#define	LINUX_NFS_SUPER_MAGIC	0x6969L
+#define	LINUX_NTFS_SUPER_MAGIC	0x5346544EL
+#define	LINUX_PROC_SUPER_MAGIC	0x9fa0L
+#define	LINUX_UFS_SUPER_MAGIC	0x00011954L	/* XXX - UFS_MAGIC in Linux */
+
+/*
+ * ext2fs uses the VT_UFS tag. A mounted ext2 filesystem will therefore
+ * be seen as an ufs/mfs filesystem.
+ */
+static long
+bsd_to_linux_ftype(int tag)
+{
+
+	switch (tag) {
+	case VT_CODA:
+		return (LINUX_CODA_SUPER_MAGIC);
+	case VT_HPFS:
+		return (LINUX_HPFS_SUPER_MAGIC);
+	case VT_ISOFS:
+		return (LINUX_ISOFS_SUPER_MAGIC);
+	case VT_MFS:
+		return (LINUX_UFS_SUPER_MAGIC);
+	case VT_MSDOSFS:
+		return (LINUX_MSDOS_SUPER_MAGIC);
+	case VT_NFS:
+		return (LINUX_NFS_SUPER_MAGIC);
+	case VT_NTFS:
+		return (LINUX_NTFS_SUPER_MAGIC);
+	case VT_NWFS:
+		return (LINUX_NCP_SUPER_MAGIC);
+	case VT_PROCFS:
+		return (LINUX_PROC_SUPER_MAGIC);
+	case VT_UFS:
+		return (LINUX_UFS_SUPER_MAGIC);
+	}
+
+	return (0L);
+}
+
+int
+linux_statfs(struct proc *p, struct linux_statfs_args *args)
+{
+	struct mount *mp;
+	struct nameidata *ndp;
+	struct statfs *bsd_statfs;
+	struct nameidata nd;
+	struct linux_statfs_buf linux_statfs_buf;
+	int error;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): statfs(%s, *)\n", p->p_pid, args->path);
+#endif
+	ndp = &nd;
+	NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args->path, curproc);
+	error = namei(ndp);
+	if (error)
+		return error;
+	NDFREE(ndp, NDF_ONLY_PNBUF);
+	mp = ndp->ni_vp->v_mount;
+	bsd_statfs = &mp->mnt_stat;
+	vrele(ndp->ni_vp);
+	error = VFS_STATFS(mp, bsd_statfs, p);
+	if (error)
+		return error;
+	bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	linux_statfs_buf.ftype = bsd_to_linux_ftype(bsd_statfs->f_type);
+	linux_statfs_buf.fbsize = bsd_statfs->f_bsize;
+	linux_statfs_buf.fblocks = bsd_statfs->f_blocks;
+	linux_statfs_buf.fbfree = bsd_statfs->f_bfree;
+	linux_statfs_buf.fbavail = bsd_statfs->f_bavail;
+  	linux_statfs_buf.fffree = bsd_statfs->f_ffree;
+	linux_statfs_buf.ffiles = bsd_statfs->f_files;
+	linux_statfs_buf.ffsid.val[0] = bsd_statfs->f_fsid.val[0];
+	linux_statfs_buf.ffsid.val[1] = bsd_statfs->f_fsid.val[1];
+	linux_statfs_buf.fnamelen = MAXNAMLEN;
+	return copyout((caddr_t)&linux_statfs_buf, (caddr_t)args->buf,
+		       sizeof(struct linux_statfs_buf));
+}
+
+int
+linux_fstatfs(struct proc *p, struct linux_fstatfs_args *args)
+{
+	struct file *fp;
+	struct mount *mp;
+	struct statfs *bsd_statfs;
+	struct linux_statfs_buf linux_statfs_buf;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): fstatfs(%d, *)\n", p->p_pid, args->fd);
+#endif
+	error = getvnode(p->p_fd, args->fd, &fp);
+	if (error)
+		return error;
+	mp = ((struct vnode *)fp->f_data)->v_mount;
+	bsd_statfs = &mp->mnt_stat;
+	error = VFS_STATFS(mp, bsd_statfs, p);
+	if (error)
+		return error;
+	bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	linux_statfs_buf.ftype = bsd_to_linux_ftype(bsd_statfs->f_type);
+	linux_statfs_buf.fbsize = bsd_statfs->f_bsize;
+	linux_statfs_buf.fblocks = bsd_statfs->f_blocks;
+	linux_statfs_buf.fbfree = bsd_statfs->f_bfree;
+	linux_statfs_buf.fbavail = bsd_statfs->f_bavail;
+  	linux_statfs_buf.fffree = bsd_statfs->f_ffree;
+	linux_statfs_buf.ffiles = bsd_statfs->f_files;
+	linux_statfs_buf.ffsid.val[0] = bsd_statfs->f_fsid.val[0];
+	linux_statfs_buf.ffsid.val[1] = bsd_statfs->f_fsid.val[1];
+	linux_statfs_buf.fnamelen = MAXNAMLEN;
+	return copyout((caddr_t)&linux_statfs_buf, (caddr_t)args->buf,
+		       sizeof(struct linux_statfs_buf));
+}
+
+int
+linux_ustat(p, uap)
+	struct proc *p;
+	struct linux_ustat_args *uap;
+{
+	struct linux_ustat lu;
+	dev_t dev;
+	struct vnode *vp;
+	struct statfs *stat;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): ustat(%d, *)\n", (long)p->p_pid, uap->dev);
+#endif
+
+	/*
+	 * lu.f_fname and lu.f_fpack are not used. They are always zeroed.
+	 * lu.f_tinode and lu.f_tfree are set from the device's super block.
+	 */
+	bzero(&lu, sizeof(lu));
+
+	/*
+	 * XXX - Don't return an error if we can't find a vnode for the
+	 * device. Our dev_t is 32-bits whereas Linux only has a 16-bits
+	 * dev_t. The dev_t that is used now may as well be a truncated
+	 * dev_t returned from previous syscalls. Just return a bzeroed
+	 * ustat in that case.
+	 */
+	dev = makebdev(uap->dev >> 8, uap->dev & 0xFF);
+	if (vfinddev(dev, VBLK, &vp)) {
+		if (vp->v_mount == NULL)
+			return (EINVAL);
+		stat = &(vp->v_mount->mnt_stat);
+		error = VFS_STATFS(vp->v_mount, stat, p);
+		if (error)
+			return (error);
+
+		lu.f_tfree = stat->f_bfree;
+		lu.f_tinode = stat->f_ffree;
+	}
+
+	return (copyout(&lu, uap->ubuf, sizeof(lu)));
+}
diff --git a/sys/compat/linux/linux_util.c b/sys/compat/linux/linux_util.c
new file mode 100644
index 000000000000..6399805a3037
--- /dev/null
+++ b/sys/compat/linux/linux_util.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 1994 Christos Zoulas
+ * Copyright (c) 1995 Frank van der Linden
+ * Copyright (c) 1995 Scott Bartram
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/vnode.h>
+
+#include <compat/linux/linux_util.h>
+
+const char      linux_emul_path[] = "/compat/linux";
+
+/*
+ * Search an alternate path before passing pathname arguments on
+ * to system calls. Useful for keeping a seperate 'emulation tree'.
+ *
+ * If cflag is set, we check if an attempt can be made to create
+ * the named file, i.e. we check if the directory it should
+ * be in exists.
+ */
+int
+linux_emul_find(p, sgp, prefix, path, pbuf, cflag)
+	struct proc	 *p;
+	caddr_t		 *sgp;		/* Pointer to stackgap memory */
+	const char	 *prefix;
+	char		 *path;
+	char		**pbuf;
+	int		  cflag;
+{
+	struct nameidata	 nd;
+	struct nameidata	 ndroot;
+	struct vattr		 vat;
+	struct vattr		 vatroot;
+	int			 error;
+	char			*ptr, *buf, *cp;
+	size_t			 sz, len;
+
+	buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
+	*pbuf = path;
+
+	for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
+		continue;
+
+	sz = MAXPATHLEN - (ptr - buf);
+
+	/* 
+	 * If sgp is not given then the path is already in kernel space
+	 */
+	if (sgp == NULL)
+		error = copystr(path, ptr, sz, &len);
+	else
+		error = copyinstr(path, ptr, sz, &len);
+
+	if (error) {
+		free(buf, M_TEMP);
+		return error;
+	}
+
+	if (*ptr != '/') {
+		free(buf, M_TEMP);
+		return EINVAL;
+	}
+
+	/*
+	 * We know that there is a / somewhere in this pathname.
+	 * Search backwards for it, to find the file's parent dir
+	 * to see if it exists in the alternate tree. If it does,
+	 * and we want to create a file (cflag is set). We don't
+	 * need to worry about the root comparison in this case.
+	 */
+
+	if (cflag) {
+		for (cp = &ptr[len] - 1; *cp != '/'; cp--);
+		*cp = '\0';
+
+		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
+
+		if ((error = namei(&nd)) != 0) {
+			free(buf, M_TEMP);
+			return error;
+		}
+
+		*cp = '/';
+	}
+	else {
+		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
+
+		if ((error = namei(&nd)) != 0) {
+			free(buf, M_TEMP);
+			return error;
+		}
+
+		/*
+		 * We now compare the vnode of the linux_root to the one
+		 * vnode asked. If they resolve to be the same, then we
+		 * ignore the match so that the real root gets used.
+		 * This avoids the problem of traversing "../.." to find the
+		 * root directory and never finding it, because "/" resolves
+		 * to the emulation root directory. This is expensive :-(
+		 */
+		NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, linux_emul_path,
+		       p);
+
+		if ((error = namei(&ndroot)) != 0) {
+			/* Cannot happen! */
+			free(buf, M_TEMP);
+			NDFREE(&nd, NDF_ONLY_PNBUF);
+			vrele(nd.ni_vp);
+			return error;
+		}
+
+		if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0) {
+			goto bad;
+		}
+
+		if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
+		    != 0) {
+			goto bad;
+		}
+
+		if (vat.va_fsid == vatroot.va_fsid &&
+		    vat.va_fileid == vatroot.va_fileid) {
+			error = ENOENT;
+			goto bad;
+		}
+
+	}
+	if (sgp == NULL)
+		*pbuf = buf;
+	else {
+		sz = &ptr[len] - buf;
+		*pbuf = stackgap_alloc(sgp, sz + 1);
+		if (*pbuf != NULL)
+			error = copyout(buf, *pbuf, sz);
+		else
+			error = ENAMETOOLONG;
+		free(buf, M_TEMP);
+	}
+
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	vrele(nd.ni_vp);
+	if (!cflag) {
+		NDFREE(&ndroot, NDF_ONLY_PNBUF);
+		vrele(ndroot.ni_vp);
+	}
+	return error;
+
+bad:
+	NDFREE(&ndroot, NDF_ONLY_PNBUF);
+	vrele(ndroot.ni_vp);
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	vrele(nd.ni_vp);
+	free(buf, M_TEMP);
+	return error;
+}